UL 3703-2015 UL standard for safety Solar Trackers (First Edition).pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 3703 Solar TrackersUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION O

2、R DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Solar Trackers, UL 3703 First Edition, Dated October 8, 2015 SUMMARY OF TOPICS This is the Publication of the ANSI-Approved First Edition of the Standard for Solar Trackers, UL 3703, which covers solar trackers intended for install

3、ation as xed trackers which are not attached to buildings, in accordance with the National Electrical Code, ANSI/NFPA 70. These requirements also cover freestanding trackers, which are by design not required to be mechanically secured in position. It covers the attachment means of solar devices to t

4、he tracker platform, in both mechanical and electrical aspects, but does not cover the solar devices themselves. These requirements cover solar trackers intended for use with solar devices with a maximum system voltage of 1500 V. The new requirements are substantially in accordance with Proposal(s)

5、on this subject dated June 26, 2015 and September 4, 2015. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provid

6、es this Standard as is without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of

7、 prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for th

8、is Standard, regardless of the form of the claim. Users of the electronic versions of ULs Standards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or

9、deviation introduced while purchaser is storing an electronic Standard on the purchasers computer system. OCTOBER 8, 2015 UL 3703 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 8, 2015 UL 3703 tr2 No Text on This PageUL COPYRIGHT

10、ED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 8, 2015 1 UL 3703 Standard for Solar Trackers First Edition October 8, 2015 This ANSI/UL Standard for Safety consists of the First Edition. The most recent designation of ANSI/UL 3703 as an America

11、n National Standard (ANSI) occurred on October 8, 2015. ANSI approval for a standard does not include the Cover Page, Transmittal Pages and Title Page. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Req

12、uest in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs Standards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards

13、 shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABORATORIES INC. ANSI/UL 3703-2015UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL OCTOBER 8, 2015 SOLAR TRACKERS - UL 3703 2 No Text on This PageUL COPYRIGHTED

14、 MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .6 2 Glossary .7 3 General .11 3.1 Components 11 3.2 Units of measurement 12 3.3 References .12 CONSTRUCTION 4 Electrical Enclosure 12 4.1 General 12 4.2 Access covers 13 4.3 Ca

15、st metal enclosures .13 4.4 Sheet metal enclosures 14 4.5 Nonmetallic enclosures .16 4.6 Openings covered by glass .17 4.7 Openings for wiring system connections 17 4.8 Openings for ventilation 19 4.9 Environmental rated enclosures .25 5 Protection Against Corrosion 28 6 Mechanical Assembly 28 7 Mou

16、nting 29 8 Protection of Users Accessibility of Uninsulated Live Parts 29 9 Protection of Service Personnel .33 10 Electric Shock 34 10.1 Voltage .34 10.2 Stored energy .36 11 Switches and Controls .39 12 Disconnect Devices .40 13 Supply Connections .41 13.1 General .41 13.2 Wiring terminals 41 13.3

17、 Wiring leads .43 13.4 Wiring compartments .44 13.5 Openings for conduit or cable connection .45 13.6 Openings for class 2 circuit conductors .45 14 Wire-Bending Space 45 15 Equipment Grounding .51 15.1 General .51 15.2 Grounding electrode terminal 53 16 Bonding for Grounding 54 17 Internal Wiring 5

18、5 17.1 General .55 17.2 Protection of wiring .57 17.3 Electrical connections .57 18 Live Parts 58 19 Separation of Circuits .58 19.1 Factory wiring 58 OCTOBER 8, 2015 SOLAR TRACKERS - UL 3703 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL

19、19.2 Field wiring 59 19.3 Separation barriers .60 20 Spacings 60 20.1 General .60 20.2 Insulating liners and barriers .62 21 Alternate Spacings Clearances and Creepage Distances 63 22 Insulating Materials .64 22.1 General .64 22.2 Barriers .65 23 Capacitors .65 24 Isolated Accessible Signal Circuits

20、 66 25 Control Circuits .67 26 Overcurrent Protection 69 26.1 General .69 26.2 Control circuit overcurrent protection 71 26.3 Output ac power circuit overcurrent protection .72 26.4 Battery circuits .72 27 Printed-Wiring Boards .73 28 Polymeric Materials Used as Mechanical Parts .73 29 Conductors 73

21、 PROTECTION AGAINST RISKS OF INJURY TO PERSONS 30 General 74 31 Moving Parts .74 32 Interruption of Power 75 33 Clearance 76 34 Moving Parts Other Than the Tracker Platform .76 35 Moving Parts Tracker Platform 76 36 Emergency Stop 77 PERFORMANCE 37 General 77 38 Maximum-Voltage Measurements .77 39 T

22、emperature Test .78 40 Dielectric Voltage-Withstand Test .82 41 Overload Test 83 42 Bonding Path Resistance Test .83 43 Strain Relief Test .83 44 Reduced Spacings on Printed Wiring Boards Tests .84 44.1 General .84 44.2 Dielectric voltage-withstand test 84 45 Bonding Conductor Test .84 46 Stability

23、Test .84 47 Enclosure Mounting Static Load Test 85 48 Compression Test 85 49 Rain and Sprinkler Tests 85 49.1 General .85 49.2 Rain test 86 49.3 Sprinkler test 89 50 Overcurrent Protection Calibration Test 91 51 Capacitor Voltage Determination Test .91 OCTOBER 8, 2015 SOLAR TRACKERS - UL 3703 4UL CO

24、PYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 52 Flexing Test 91 53 Power Restoration Test 92 54 Locked Platform Test 92 55 Emergency Stop Test .92 56 Corrosive Atmosphere Tests and Metallic Coating Thickness Test 92 57 Temperature Cycling Test

25、 for Components not within an Enclosure .92 58 Humidity Cycling Test for Components not within an Enclosure 92 59 Mechanical Loading Test 92 60 Terminal Torque Test .93 61 Accelerated Aging Test 93 62 Bonding Strap Pull Test .93 RATINGS 63 General 93 MARKINGS 64 Details .94 65 Cautionary Markings .1

26、02 66 Equipment Information and Instructions 104 66.1 Separation of information .104 66.2 Operating and installation instructions .104 67 Important Safety Instructions 105 INSTRUCTIONS 68 Dielectric Voltage-Withstand Test 109 APPENDIX A Standards for ComponentsA1 OCTOBER 8, 2015 SOLAR TRACKERS - UL

27、3703 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover solar trackers intended for installation as xed trackers which are not attached to buildings, in accordance with the National Electrical

28、Code, NFPA 70. Trackers intended to be installed in an area where public access is anticipated shall be evaluated for all mechanical hazards as dened in this standard. Trackers intended to be installed in an area where public access is restricted by a fence, secured location, etc. should be evaluate

29、d with consideration given to the mechanical hazard requirements of this standard. These requirements also cover freestanding trackers, which are by design not required to be mechanically secured in position. 1.2 These requirements cover the attachment means of solar devices to the tracker platform,

30、 in both mechanical and electrical aspects, but do not cover the solar devices themselves. The solar devices shall have all suitable electrical and mechanical characteristics in order to be attached to the tracker evaluated in accordance with this standard. Any solar devices attached to the tracker

31、shall be compliant with the solar devices standard for safety, and the specic mounting, bonding, and grounding means described in the trackers installation manual. Alternatively, the combination of tracker and solar device can be evaluated in accordance with this standard and relevant solar device s

32、tandards, such as, but not limited to, the Standard for Flat-Plate Photovoltaic Modules and Panels, UL 1703, for at plate PV modules, and the Outline for Concentrator Photovoltaic Modules and Assemblies, UL 8703, for CPV modules. 1.3 The tracker and its functions are to be evaluated with respect to

33、risk of electric shock, mechanical and re hazards. Any part of the tracker that is utilized for mechanical support, bonding or grounding of the solar devices shall comply with the Standard for Mounting Systems, Mounting Devices, Clamping/Retention Devices, and Ground Lugs for Use With Flat-Plate Pho

34、tovoltaic Modules and Panels, UL 2703, or as referenced to UL 2703 within the requirements of this standard. 1.4 These requirements cover solar trackers intended for use with solar devices with a maximum system voltage of 1500 V. 1.5 These requirements do not cover: a) Equipment intended to accept t

35、he electrical or thermal output from the solar devices, such as inverters, converters, charge controllers, and batteries; b) Trackers installed in hazardous locations; c) Mechanical or structural integrity of the tracker under wind conditions, seismic conditions, and uplift conditions of the tracker

36、 base and base to platform connection; d) Trackers installed in marine, offshore, and/or locations above standing water; and e) Lightning striking the tracker. OCTOBER 8, 2015 SOLAR TRACKERS - UL 3703 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

37、 FROM UL 2 Glossary 2.1 For the purpose of this standard, the denitions in 2.2 2.48 apply. 2.2 BARRIER A part inside an enclosure that reduces access to a part that involves a risk of re, electric shock, injury to persons, or electrical energy-high current levels. 2.3 BRANCH CIRCUIT The portion of t

38、he building wiring system beyond the nal overcurrent protective device in the power-distribution panel that protects the ac output of the eld-wiring terminals in a permanently connected tracker. 2.4 CHARGE CONTROLLER A device intended to control the charging process of storage batteries used in phot

39、ovoltaic power systems. 2.5 CLASS 2 TRANSFORMER A step-down transformer complying with the applicable requirements in the Standard for Low Voltage Transformers Part 1: General Requirements, UL 5085-1, and the Standard for Low Voltage Transformers Part 3: Class 2 and Class 3 Transformers, UL 5085-3.

40、2.6 CONTROL CIRCUIT A circuit that carries low-voltage, limited-energy (LVLE) electric signals and not main power, voltage or current. 2.7 CONVERTER A device that accepts ac or dc power input and converts it to another form of ac or dc power. For the purposes of this standard and unless otherwise sp

41、ecied, ac output converters intended to directly supply power to loads are to be subjected to all of the requirements for inverters. 2.8 DC GROUND FAULT DETECTOR/INTERRUPTER A device that provides protection for photovoltaic arrays by detecting a ground fault and interrupting the fault path in the d

42、c circuit. 2.9 DEAD METAL An electrically conductive metal part of the tracker which is not electrically connected to, or is, a source of voltage, and has no electric potential difference with respect to earth ground during the intended operation. 2.10 DEGREE OF PROTECTION The extent of protection p

43、rovided by an enclosure against access to parts which involve a risk of injury to persons, ingress of foreign solid objects, and/or ingress of water as veried by standardized test methods. 2.11 DISCONNECT DEVICE A device that disconnects the conductors of a circuit from a supply, source, utility, or

44、 load. 2.12 ELECTRIC POWER SYSTEM (EPS) Equipment or facilities that deliver electric power to a load. The most common example of an EPS is an electric utility. 2.13 EMERGENCY STOP A safety mechanism used to shut off the tracker in an emergency situation, which overrides all automatic controls and s

45、tops the moving of the tracker as quickly as possible, and the tracker needs a manual reset to return to an automatic control and moving. OCTOBER 8, 2015 SOLAR TRACKERS - UL 3703 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.14 ENCLOSUR

46、E A surrounding case constructed to provide a degree of protection against: a) The accessibility of a part that potentially involves a risk of re, electric shock or injury to persons, or b) The risk of propagation of ame, sparks, and molten metal initiated by an electrical disturbance occurring with

47、in. 2.15 FIELD-WIRING LEAD A lead to which a supply, load, or other wire is intended to be connected by an installer. 2.16 FIELD-WIRING TERMINAL A terminal to which a supply, load, or other wire is intended to be connected by an installer. 2.17 FIXED TRACKER A tracker that is intended to be permanen

48、tly connected mechanically and electrically and only able to be detached by the use of a tool. 2.18 FREESTANDING TRACKER A tracker that is not intended to be permanently connected mechanically and electrically, such as, but not limited to portable (not xed) oor units. 2.19 GROUNDED CONDUCTOR A syste

49、m or circuit conductor that is intentionally grounded. 2.20 GUARD A part outside of the enclosure that reduces access to a component involving a risk of injury to persons. 2.21 INTERCONNECTION SYSTEM EQUIPMENT (ISE) A component or system of components that performs protective and control functions used to interconnect a distributed resource to an EPS. 2.22 INVERTER An electronic device that changes dc power to ac power. 2.23 ISOLATED CIRCUIT A circuit having an isola